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Robert De Niro is Jimmy Fallon's first guest

Van Morrison will perform on March 2 debut

NEW YORK – If Jimmy Fallon is nervous about the premiere of his new gig as "Late Night" host, he'll have showbiz heavyweights Robert De Niro and Van Morrison to lean on. They'll be the guests for Fallon's March 2 debut hosting the NBC late-night show.

Fallon replaces Conan O'Brien, who has his final show Friday before heading out west to take over the "Tonight" show in June.